gresty



3 sham-sheet 1.

(No Model.) 1

J. E. GRESTY STEAMVBOILER.

Patented Aug. 22, 18903.

(N0 M0de'l.) J GRESTY 3 Sheets-Sheet 2 STEAM BOILER.

No. 503,700. Patented Aug. 22,1093.

. Q 0 0 i r? 0 E m l 0 E I Q 'Q a N a 0 (No-Model.) 3 Sheets-Sheet 3. J.E. ESTY. I

STEA OILBRL No. 503,700. Patented Aug. 22, 1893.

NITED ST Tins JOHN EDWARD GRESTY, OF MANCHESTER, ENGLAND.

STEAM- BOILER.

SPECIFIGATION forming part of Letters Patent No. 503,700, dated August22, 1893.

Application filed March 21, 1892. :Serial No. 425,866. (No model.)

To all whom it may concern:

Be it known that I, JOHN EDWARD GRESTY, a subject of the Queen of GreatBritain, residing at Manchester, in the county of Lancaster, England,have invented certain new and useful Improvements in or Relating to inany position most suitable to the form of boiler to which myinventionmay be applied, said double tubes being constructed by forming an outertube which is closed at one end and open at the other, and insertingtherein an inner tube of smaller diameter, that is open at both ends,and with a space between said inner and outer tubes, for purposeshereinafter described.

The objects of this invention are to secure better combustion of thefuel, to prevent the production of smoke, to secure an efficient use ofthe radiated heat from the fuel while in combustion for the productionof steam, instead ofbeing wasted through brick walled furnaces, and tosecure economy in the use of fuel. I attain these objects by the meanshereinafter described and as illustrated in the accompanying sheets ofdrawings.

In the several views shown therein similar letters refer to similarparts.

Figure 1 represents an end view and Fig. 2 a longitudinal section online C D of aboiler constructed according to this invention and as ishereinafter described. Fig. 3 is a sectional elevation, partlymutilated, and on a larger scale, of the double tube and steam and waterbox. Fig. 4 shows in cross section and longitudinal section, thecombination of the tubes and fire bricks. Fig. 5 shows my invention aspracticed with a series of longitudinal single tubes, and Fig. 6 showsit as embodyingaseries of transversely placed single tubes.

In Figs. 1 and 2 I have shown my invention applied to a boiler of theordinary water tube fitype, a series of the aforesaid double tubes 1):being placed above and on either side of the furnace a in alongitudinal direction. This se- ;ries of double tubes is shown bottleshaped, or tubes in which one of the ends b'is closed, and the other endI) is open; the open ends 72 of said tubes are attached to, andterminate in a steam and water box 6, the closed rear ends 1/ extendinginto the combustion chamberf. I attach the tubes b to the steam andwater box e by carrying the open ends 12 through steam and water box andattaching said open ends to the plate e thereby obtaining additionalsecurity and support, but in order that the circulation may not bealtered or afiected thereby and may continue the same as if said openends of tubes b were attached to the back plate e of the steam and Waterbox e, I form apertures b in those portions of the tubes that are withinthe box 6. Within each of said bottle shaped tubes Z) I place a tube 9as shown in Fig. 3, which represents the tube 17 and part of the Waterbox e drawn to an enlarged scale. The tube g is of a smaller diameterthan the internal diameter of the tube 6 so as to form a space betweenthe out-side of the tube g and the inside of the tube b: said tube 9extends at its rear end 9 to within a short distance of each of theclosed ends I) of the aforesaid bottle shaped tubes 1); the front ends 9are passed through the steam and water box 6 and ex tending beyond theapertures 12 of the bottle shaped tubes, terminate in and are connectedto the water box or slab e, bymeans of the neck j which is taper shapeand inserted and pressed into the end of the tube 1) that is attached tothe plate 6 of water box as herein before described.

I construct the steam and water box 6 either of the shape shown ondrawings, or circular, semicircular, or other preferred form.

I close the spaces between the outer row of tubes 1) surrounding furnaceby means of suitably shaped fire bricks k as shown in Fig. at in orderto confine and direct the hot gases along said tubes on the inner orfurnace side,

into the combustion chamber f, where they pass around the closed ends ofthe aforesaid tubes 1), from whence they are deflected and directed bythe fire bridge Z over the sides of the tubes farthest from the furnace,and

passing in an upward or forward direction circulate-through the inclinedwater tubes. forming boiler. Y

Iplace beneath the ordinary fire bars of furnace in a longitudinaldirection as shown in Fig. 2, a convenient numberof tubes h, the frontends of which Iconnect to the aforesaid water box or slab e and the rearends of said tubes to a mud drum h placed at rear end 1 of boiler. r Iconnect the upper part of steam and water box e to a' steam and waterdrum Z placed above the series or nest of inclined tubes 'm 1 which formthe boiler, by the use either of. vertical tubes or by a slab, or byheaders 19 as shown on drawings to which the front ends of aforesaidinclined tubes m forming boiler are attached or connected. By thesemeans, the circulation is carried from the rear end of boiler along thetubes h connecting, the mud drum h with the bottom part of water i. boxor slab e, entering therefrom into the: tubes 9 that are placed withinthe bottle I shaped tubes b, extending over and on each side of furnace,passing from thence into the closed or rear ends I) of the tubes b andreturning along the space that is formed between the inner and outertubes, into the i steam and water box e at front of boiler and fromthence either through the aforesaid vertical tubes, or slabs, or throughthe headers 1), into the upper steam and water drum Z. If in addition tothe hereinbefore described E double tubes 1) extending over and around;furnace, a row of like tubes are used under the furnace so as toentirelyincase the furi na-ce, I place the tubes h connecting :mud l drum withthe front water box 6 either on: each side of furnace or in otherconvenientf position. I Fig. 5. .represents a-seriesof single tubes b Iplaced in a longitudinal position over and on each side of furnace at,and may also be placed underneath said furnace if desired, terminatingin .a header b the spaces between theI outersides of said tubes beingclosed by suitably shaped fire bricks in the manner hereinbeforedescribed. Fig. 6. represents a series of single tubes 6 placedtransversely around furnace with their ends connected to a header bplaced overf center of furnace, the spaces on outersides of said tubesbeing filled in with fire bricks '70 as hereinbefore described. Thecentral header and the end tubes of the series nearest the combustionchamber f are also incased with 5 fire brick. 1

To assist secondary combustion I may form openings 7;, see Fig. 2, inthe fire bricks form-.1 ing'combustion chamber or the fire bridge,through which hot air may be passedto mix with the gases and the flamefrom the fur- H306.

What I claim as my invention, and desire to. secure by Letters Patent ofthe United States, is I 1. In water tube or other forms of steamboilers, a series of double tubes composed of an outer tube closed atone end and open at the other and a smaller inner tube open at bothends, placed in a longitudinal direction over or surrounding thefurnace, with their front ends connected to a water box, slab or header,and their rear ends extending into a combustion chamber formed betweenthe ends of tubes and fire brick wall, the spaces between the outersides of said tubesbeing filled in with suitably shaped fire bricks allcombined and arranged substantially as set forth in order that theflames from the furnace may be caused to pass along the under or innerside, round the rear ends of said tubes and return along the oppositesides thereofin the manner and for the purpose substantially as hereinbefore described.

2. In a water tu'beior other form of steam boiler, a series of tubesplaced in a longitudinal direction over or surrounding the furnace thatis to say, above and on each side thereof with their front endsconnected to a water box, slab orheader, and their rear ends extendinginto a combustion chamber, and

, connected to a header of any convenient shape, the spaces between theouter sides of said tubes being filled in with suitably shaped tirebricks all combined and arranged substantially asset forth, in orderthat the flames from the furnace may be caused to pass along the underor inner side round the rear ends of said tubes, and return along theopposite F sides thereof for the purposeand in the manner substantiallyas herein before described.

3. In a water-tube or other form of steam iboiler, the combination withthe combustion chamber, of tubes .arran ged above and on each side ofsuch chamber and extending into the same and terminating in a header,fire-brick inserted in and filling the spaces between the outer sides ofsaid tubes, and a fire-bridge arranged at the rear of and above thecombustion chamber and beneath the boiler, all arranged substantially asdescribed, so that the fiames fromthe furnace shall pass along the underside' and around the rear portion of said tubes and along the oppositeside thereof, in the manner and for the purpose set forth.

In testimony whereof I have hereunto set 5 my hand this 7th day ofMarch, A. D. 1892.

JOHN EDWARD GRESTY. Witnesses:

LEONARD H. DEAN,

THOMAS PRESCOTT.

